I dunno; I have a picture of my dad and uncle at about ages 14 and 9 wearing green and pink (respectively) RUFFLED SHIRTS. No joke. (Quinquagenarians here, please don’t be insulted.)
He never wore white shirts.
But I consider it as more of a thing like girls wear uniforms to school. Girls wear whatever color shirts, and boys wear whatever color shirts (in this case white).